DE102009041612B4 - Explosion-proof housing with signaling device and light-conducting device for such a housing - Google Patents

Explosion-proof housing with signaling device and light-conducting device for such a housing

Info

Publication number
DE102009041612B4
DE102009041612B4 DE102009041612.9A DE102009041612A DE102009041612B4 DE 102009041612 B4 DE102009041612 B4 DE 102009041612B4 DE 102009041612 A DE102009041612 A DE 102009041612A DE 102009041612 B4 DE102009041612 B4 DE 102009041612B4
Authority
DE
Germany
Prior art keywords
housing
light
lens
front
threaded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
DE102009041612.9A
Other languages
German (de)
Other versions
DE102009041612A1 (en
Inventor
Helmut Würz
Siegfried Roll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
R Stahl Schaltgerate GmbH
Original Assignee
R Stahl Schaltgerate GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by R Stahl Schaltgerate GmbH filed Critical R Stahl Schaltgerate GmbH
Priority to DE102009041612.9A priority Critical patent/DE102009041612B4/en
Publication of DE102009041612A1 publication Critical patent/DE102009041612A1/en
Application granted granted Critical
Publication of DE102009041612B4 publication Critical patent/DE102009041612B4/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02BBOARDS, SUBSTATIONS, OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/26Casings; Parts thereof or accessories therefor
    • H02B1/28Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • F21V5/008Combination of two or more successive refractors along an optical axis
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00Safety devices structurally associated with lighting devices
    • F21V25/12Flameproof or explosion-proof arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

Housing (1) in the type of protection flameproof enclosure, with a through hole designed as a threaded bore in a wall (2) of the housing, with a threaded bushing (5), with a clear translucent filling body (10) in the threaded bushing (5), which is screwed into the threaded bore of the wall (2), wherein the filler body (10) is bounded at the end by plane surfaces (12, 13), one of which is in the housing (1) and the other is visible from the outside, with a converging lens (15) in front of the inner plane surface (13), with a diverging lens (16) in front of the outer plane surface (12) and with an LED (18) in front of the inner converging lens (15).

Description

  • In systems, there is often the need to signal certain operating conditions. As far as these systems are operated in a normal non-hazardous environment, this is done in a simple manner by light-emitting diodes which are attached to the device. The matter becomes difficult when the plant components are encapsulated due to a potentially explosive atmosphere. Once the signaling device is located outside the explosion-proof housing, the electrical cables must be passed through the wall of the housing in a very complicated manner. The effort that needs to be done is not insignificant.
  • It would be cheaper to accommodate the signaling device within the housing. Then there is the problem of visibility.
  • It is also known to install disks in the ex-protected housing through which measuring devices located behind are readable. However, transparent materials are less strong than the other housing material, which is especially disturbing noticeable when the area that takes up the disc is large. The larger the area of the disk, the more difficult it is to ensure its breaking strength, so that it can withstand the pressure that occurs when an explosion takes place inside the housing.
  • In the case of a light-emitting diode, in principle a slim rod of transparent material would be sufficient to make the light-emitting diode visible from the outside. The disadvantage of this solution, however, is the low angle under which light exits. In addition, this is disturbing that the outgoing light from the LED is emitted divergently. Such light would be totally reflected on the cylindrical outer surface of the rod-shaped light guide only partially. Much of it would be absorbed there. Accordingly, the light output is correspondingly poor.
  • DE 20 2004 004 666 U1 describes a device for monitoring the lighting in a room to be kept closed. In a sleeve, a light guide cable is arranged from a bundle of optical fibers. The optical fibers are connected on the one hand to a light receiver and on the other hand to a display, which are each formed by a lens. At both ends a cover frame is screwed to secure the assembly to a wall. An explosion-proof device is not described.
  • DE 103 129 50 A1 describes a motor vehicle light. The light from light sources, for example light emitting diodes, can be directed via light guides to a light exit point. An explosion-proof device and in particular an explosion-proof implementation of a light-conducting device through a housing wall is not described.
  • An explosion-proof luminaire with two separate housings describes DE 78 13 602 U1 , The two housings are connected to each other via a fiber optic cable. Also from this document it is not known how the fiber optic cable can be passed explosion proof through the walls of the two housings.
  • Proceeding from this, it is an object of the invention to provide an arrangement in which a light-emitting diode from a relatively large angular range is visible and little light is lost in the passage.
  • This object is achieved by the flameproof enclosure with the features of claim 1 and by a light guide for such a housing according to claim 8.
  • The new housing has a passage opening in a wall. In this passage opening sits a filler of a crystal-clear material. The filler is provided with flat surfaces at both ends. In front of the inner surface facing the housing surface is a converging lens, while a diverging lens is provided in addition to the outer surface.
  • Due to the condensing lens arranged on the inside of the housing, a large part of the divergently emitted light is converted into a light beam with parallel rays. Light which would be radiated against the outer surface of the filling body without the convergent lens and would be absorbed there, passes into the interior of the filling body due to the converging lens and can be transmitted to the outside without reflection at interfaces.
  • The arranged on the outside diverging lens now again ensures that the light beam consisting of parallel light beams is fanned out, so that a large viewing angle is achieved.
  • By combining the converging lens with the diverging lens, the light-emitting diode is virtually shifted towards the outside of the filling body.
  • The opening in the housing may be a threaded hole and the filler sitting in a threaded bushing. He can be glued in there.
  • The filler has a cylindrical shape, which particularly simplifies installation in the socket. The diameter of the filling body can be chosen so that overall a great strength is created, which is comparable to the strength of the adjacent wall.
  • Both the converging lens and the diverging lens can be attached to the filler body in a material-locking manner or can be made together without joining surface.
  • Favorable optical relationships may result when both the condenser lens and the diverging lens are aspheric rotationally symmetric lenses, i. H. preferably they can have parabolic shape.
  • Incidentally, developments of the invention are the subject of subclaims.
  • The following description of the figures explains aspects for understanding the invention. Further details not described to those skilled in the usual manner can be seen from the drawings, which supplement the description of the figures.
  • The following drawings are not necessarily to scale. To illustrate details, certain areas may be exaggerated. Moreover, the drawings are simplistically simplified and do not include any detail that may be present in the practice. The terms "top" and "bottom" or "left" and "right" refer to the illustration in the figures.
  • 1 shows an explosion-proof housing with a view of the front side.
  • 2 shows the structure of the signaling device in longitudinal section.
  • 1 shows an explosion-proof housing 1 , the one facing the viewer front or front panel 2 having. The front panel has a total of four screws 3 attached to the body of the case, located just behind the front panel 2 extends.
  • In the front panel 3 sits a signaling device 4 their structure based on 2 is explained below.
  • The signaling device 4 has a threaded bush 5 on, which is a cylindrical stepped bore 6 contains. The stepped bore 6 changes to a plane shoulder 7 the diameter. The arrangement is made so that the shoulder 6 to the housing interior shows, ie, the front side lying portion has a smaller diameter than the housing inner side lying portion. In addition, the section lying inside the housing is dimensioned significantly larger in length.
  • The threaded bush 5 is on the outside with a continuous thread 8th provided with it into a corresponding through hole of the front panel 2 is screwed. The thread 8th forms with the thread in the front panel 2 an explosion-proof thread.
  • In the stepped bore 6 sits a glass body 10 , The vitreous 10 consists of a clear translucent material, such as glass or a corresponding plastic, such as acrylic or polycarbonate.
  • The vitreous 10 is formed as a substantially rotationally symmetrical body and is divided into a center piece 11 that to the shoulder 7 at an imaginary plane surface 12 and to the housing interior to an imaginary plane 13 extends. The outer diameter of the middle piece 11 corresponds to the inner diameter of the portion of the through hole 6 with the larger diameter. The plane surface 12 is on the shoulder 7 while the plane surface 13 with the respective adjacent ends of the threaded bushing 5 is flush.
  • On the plane surface 13 is a condensing lens 14 formed, whose optical axis with the longitudinal axis of the cylindrical central or intermediate piece 11 coincides. The condenser lens 14 may be a spherical lens or an aspherical lens having a paraboloid shape. The latter embodiment is advantageous for optical reasons.
  • On the plane surface 12 there is a diverging lens 16 whose optical axis coincides with the optical axis 14 of the system coincides. Also the diverging lens 16 may be a spherical or an aspherical lens with a paraboloid surface.
  • The two lenses 15 and 16 can with the middle piece 11 be glued or cemented to the flat surfaces or be made in one piece with this without further joining surfaces. The joining area-free design allows the entire glass body 10 to inject in one piece.
  • As can be seen from the figure further has the stepped bore 6 to the connection to the shoulder 7 to the outside a length corresponding to the length of the diverging lens 16 , This is thus on the front side of the threaded bushing 5 no over.
  • The vitreous 10 is in the stepped hole 6 glued. Due to the bonding and the interaction of the plane surface 12 with the shoulder 7 results in a very effective attachment of the vitreous body 10 in the threaded bush 5 , An explosion inside the explosion-proof enclosure 1 can do the vitreous 10 not from the threaded bush 5 to fling out.
  • Because the diameter of the vitreous body 10 is very small, no particularly solid material needs to be used. In particular, it is advantageous if the diameter of the central area 11 smaller than its length.
  • The sizing of the focal lengths of the two lenses 15 and 16 follows from the following functional description.
  • The condenser lens 15 has a relatively short focal length. In her at 17 indicated focal point is a light emitting diode 18 ,
  • The light-emitting diode 18 radiates its borders by marginal rays in an azimuth angle 20 and 21 are symbolized, light off. This light falls on the condenser lens 15 and becomes there a parallel beam that passes through the central section 11 passes through essentially unimpaired. The light passes as a parallel light beam to the optically active surface of the diverging lens 16 , which fanning the light bundle back into a divergent light beam.
  • The shorter the focal length of the diverging lens 16 is, the greater the angle, the two marginal rays 20 and 21 after exiting the lens 16 exhibit.
  • The diverging lens 16 has a virtual focus at 22 is drawn in and near the plane surface 12 lies.
  • Light that is outside the two marginal rays 20 and 21 from the light emitting diode 18 is sent out, is lost and is not visible on the outside. However, the light that is the light emitting diode 17 between the marginal rays 20 and 21 emits the largest share when the LED shows a corresponding radiation lobe.
  • As can be seen from the presentation of 2 easily results, is at the corresponding radiation lobe of the light emitting diode 18 practically all the light emitted through the glass body 10 passed therethrough to the outside of the housing to be radiated there again as a divergent light beam. Due to the optics is the LED 18 apparently in focus 22 the diverging lens 16 postponed.
  • Due to the optics used, virtually the entire of the light emitting diode 18 emitted light also provided for signaling on the front of the explosion-proof housing. Due to the divergence of the light at this point, the light is also from a very large angular range, ie very far away from the optical axis 14 to recognize.
  • The illustration also shows that the component with which the signaling is carried out to the outside is very simple and requires no electrical feedthroughs. The arrangement can be used in virtually any threaded bushing which is present in the Ex-housing, for example in the threaded holes through which normally explosion-proof cables are inserted into the housing.
  • The arrangement shown is suitable in the same way for housing with sand encapsulation if it is ensured that in the space between the light emitting diode and the condenser lens 15 no sand can get. Because the condenser lens 15 has a very short focal length, a corresponding free space can readily be kept ready here, for example, in which there is still an additional conical housing is kept ready, in which the light-emitting diode from one end and from the other end dips the convergent lens. The resulting volume is so small that the sand encapsulation is not affected.
  • The walls of such an imaginary housing correspond to the course of the marked marginal rays 20 and 21 between the LED 18 and the plane surface 13 ,
  • An explosion-proof housing contains a threaded opening. In the threaded opening sits a threaded bushing, which contains a glass body in its interior. The glass body is provided on the outside with a diverging lens and on the inside with a converging lens. At the focal point of the converging lens sits a light emitting diode. In this way, it is ensured that the light occurring within the collecting area of the condenser lens is converted into parallel light, which passes through the glass body towards the diverging lens. Through the diverging lens, the parallel light beam is converted back into a divergent light beam, so that the exiting light is visible from a wide range of angles.

Claims (8)

  1. Casing ( 1 ) in the type of protection Flameproof Enclosure, with a threaded hole in a wall ( 2 ) of the housing, with a threaded bush ( 5 ), with a clear translucent filler ( 10 ), which in the threaded bush ( 5 ) sitting in the threaded hole of the wall ( 2 ) is screwed, wherein the filling body ( 10 ) end of plane surfaces ( 12 . 13 ), of which one in the housing ( 1 ) and the other is visible from the outside, with a condenser lens ( 15 ) in front of the inner plane ( 13 ), with a diverging lens ( 16 ) in front of the outer plane ( 12 ) and with an LED ( 18 ) in front of the inner condenser lens ( 15 ).
  2. Housing according to claim 1, characterized in that the filling body ( 10 ) has a cylindrical shape.
  3. Housing according to claim 1, characterized in that the collecting lens ( 15 ) with the filler ( 10 ) is bonded cohesively or without joining surface.
  4. Housing according to claim 1, characterized in that the diverging lens ( 16 ) with the filler ( 10 ) is bonded cohesively or without joining surface.
  5. Housing according to claim 1, characterized in that the filling body ( 10 ) consists of mineral glass or plastic.
  6. Housing according to claim 1, characterized in that the filling body ( 10 ) in the threaded bushing ( 5 ) is glued.
  7. Housing according to claim 1, characterized in that the lenses ( 15 . 16 ) are spherical or aspherical lenses.
  8. Light guide device for an explosion-proof housing ( 1 ), with a threaded bushing ( 5 ) and with a clear translucent filler ( 10 ), which in the threaded bush ( 5 ), which are for insertion in a threaded bore of a wall ( 2 ) of the housing ( 1 ) is determined, wherein the filling body ( 10 ) end of plane surfaces ( 12 . 13 ) is limited, of which in the inserted state of the light-conducting device in the housing ( 1 ) the one, inner plane surface ( 13 ) in the housing ( 1 ) and the other, outer plane ( 12 ) is visible from the outside, with a converging lens ( 15 ) in front of the inner plane ( 13 ), with a diverging lens ( 16 ) in front of the outer plane ( 12 ).
DE102009041612.9A 2009-09-17 2009-09-17 Explosion-proof housing with signaling device and light-conducting device for such a housing Active DE102009041612B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102009041612.9A DE102009041612B4 (en) 2009-09-17 2009-09-17 Explosion-proof housing with signaling device and light-conducting device for such a housing

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009041612.9A DE102009041612B4 (en) 2009-09-17 2009-09-17 Explosion-proof housing with signaling device and light-conducting device for such a housing
PCT/EP2010/063574 WO2011032997A2 (en) 2009-09-17 2010-09-15 Explosion protection housing having signaling device
US13/496,747 US8820969B2 (en) 2009-09-17 2010-09-15 Explosion protection housing with signaling device

Publications (2)

Publication Number Publication Date
DE102009041612A1 DE102009041612A1 (en) 2011-03-24
DE102009041612B4 true DE102009041612B4 (en) 2016-06-30

Family

ID=43603376

Family Applications (1)

Application Number Title Priority Date Filing Date
DE102009041612.9A Active DE102009041612B4 (en) 2009-09-17 2009-09-17 Explosion-proof housing with signaling device and light-conducting device for such a housing

Country Status (3)

Country Link
US (1) US8820969B2 (en)
DE (1) DE102009041612B4 (en)
WO (1) WO2011032997A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014079481A1 (en) * 2012-11-20 2014-05-30 Siemens Aktiengesellschaft Indicator lamp

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7813602U1 (en) * 1978-05-05 1978-08-17 Adolf Schuch Kg, Lichttechnische Spezialfabrik, 6520 Worms Hardened light
DE202004004666U1 (en) * 2004-03-25 2004-07-08 Evertz, Rolf Monitor or illumination of room to be kept closed with inner light detector and external display, both coupled to ends of optical fibre or optical fibre cable
DE10312950A1 (en) * 2003-03-22 2004-10-14 Lear Automotive Electronics Gmbh Illumination module with at least one light source in lamp housing in car, with light source spatially separated from module, with light source light guided by optical fibre to light outlet in module in lamp housing

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3228288A (en) * 1961-10-20 1966-01-11 Square D Co Interlocking cap and lens for indicator lights
US4156891A (en) * 1976-09-27 1979-05-29 Roche Thomas F Explosion-proof emergency light
GB2082748B (en) 1980-08-30 1984-12-05 Oxley Robert Frederick Indicator lamps
US4463399A (en) * 1982-07-19 1984-07-31 Square D Company Circuit for intrinsically safe pilot light
US4811179A (en) * 1986-04-28 1989-03-07 Koito Manufacturing Co., Ltd. Display device
US5042048A (en) * 1990-03-02 1991-08-20 Meyer Brad E Target illuminators and systems employing same
US5821695A (en) * 1996-08-06 1998-10-13 Appleton Electric Company Encapsulated explosion-proof pilot light
DE10210635B4 (en) * 2002-03-11 2005-06-16 R. Stahl Schaltgeräte GmbH Explosion-proof enclosure with modular attachment housing
US7632004B2 (en) * 2004-07-06 2009-12-15 Tseng-Lu Chien LED night light with more than 1 optics means
US7591098B2 (en) * 2004-04-06 2009-09-22 Surefire, Llc Accessory devices for firearms
DE202006005516U1 (en) * 2005-11-03 2006-10-19 Drolshagen, Jürgen Divergent electromagnetic radiation transmitting arrangement for use with night-vision device, has radiation source and optical unit, where divergent emitted electromagnetic radiation is limited to value in its radiation intensity
US7525424B2 (en) * 2006-08-15 2009-04-28 Patented Technology Incorporated Illuminated trail marker apparatus
US8228206B2 (en) * 2008-08-18 2012-07-24 Cooper Technologies Company Explosion indicator for explosion-proof enclosures

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7813602U1 (en) * 1978-05-05 1978-08-17 Adolf Schuch Kg, Lichttechnische Spezialfabrik, 6520 Worms Hardened light
DE10312950A1 (en) * 2003-03-22 2004-10-14 Lear Automotive Electronics Gmbh Illumination module with at least one light source in lamp housing in car, with light source spatially separated from module, with light source light guided by optical fibre to light outlet in module in lamp housing
DE202004004666U1 (en) * 2004-03-25 2004-07-08 Evertz, Rolf Monitor or illumination of room to be kept closed with inner light detector and external display, both coupled to ends of optical fibre or optical fibre cable

Also Published As

Publication number Publication date
US8820969B2 (en) 2014-09-02
WO2011032997A3 (en) 2011-06-03
WO2011032997A2 (en) 2011-03-24
DE102009041612A1 (en) 2011-03-24
US20120281419A1 (en) 2012-11-08

Similar Documents

Publication Publication Date Title
EP1880139B1 (en) Led illumination module
RU2427012C2 (en) Optical device for light-emitting diode light sources
US7201509B2 (en) Lighting unit with light source and optical waveguide
US3576563A (en) Railroad signal having light piping from source mounted an exterior of reflector cone
US4743765A (en) Arrangement of a sighting mark and a light-producing source of energy therefor
US20040155565A1 (en) Method and apparatus for the efficient collection and distribution of light for illumination
US7217022B2 (en) Optic fiber LED light source
US9574734B2 (en) Lightguide module
US6948838B2 (en) Vehicle lamp having prismatic element
US3942901A (en) Optical sighting instrument with means for producing a sighting mark
US20030099113A1 (en) Lamp for vehicles
US5436806A (en) Illumination device
JP5528287B2 (en) Luminous flux control member, light emitting device, and illumination device
DE602006000180T2 (en) Lighting unit for motor vehicles with a light distribution with a light-dark border
TW200541109A (en) Illumination system with aligned LEDs
EP2381278A3 (en) Diffuser for light from light source array and displays incorporating same
JP5657679B2 (en) Lens for asymmetric light beam generation
WO2001000443A1 (en) Vehicular puddle light
JP4725176B2 (en) Optical component and lighting apparatus using the optical component
US6523984B2 (en) Fiber optic replicant lamp
JP6479469B2 (en) Optical element, illumination system, and luminaire for providing skylight appearance
CA2472959C (en) Single lens for led signal light
EP2157363A3 (en) Optical element for vehicle lamp
DE10325330B4 (en) Headlight for motor vehicles
EP1854667B1 (en) Lamp unit and outside rear view mirror with a lamp unit

Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
R016 Response to examination communication
R016 Response to examination communication
R016 Response to examination communication
R016 Response to examination communication
R018 Grant decision by examination section/examining division
R020 Patent grant now final